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== Variation ==
== Variation ==
The prevailing theory in [[Biology]] is that natural selection is is the mechanism by which [[allele]] frequency within a population changes over time due to [[genetic variation]] and selection pressures.
The prevailing theory in [[Biology]] is that natural selection is the mechanism by which [[allele]] frequency within a population changes over time due to [[genetic variation]] and selection pressures.
Genetic variation thus occurs due to several factors.
Genetic variation thus occurs due to several factors.